Denon AVR-5805 Supplementary Manual page 4

Protocol specification
The following three data forms is defined.
COMMAND : The message sent to a system(AVR/AVC) from a controller(Touch Panel etc.)
A command to a system is given from a controller.
EVENT : The message sent to a controller(Touch Panel etc.) from a system(AVR/AVC)
The result is sent, when a system is operated directly and a state changes.
*The form of EVENT presupposes that it is the same as that of COMMAND.
**Refer to the following table for the contents of COMMAND and EVENT.
RESPONSE : The message sent to a controller(Touch Panel etc.) from a system(AVR/AVC)
if the 'request command' (COMMAND+?+CR(0x0D)) has came from a controller.
The RESPONSE should be sent within 200ms of receiving the COMMAND.
*The form of RESPONSE presupposes that it is the same as that of EVENT.
Basic specification
: The command by ASCII CODE, parameter expression
*ASCII CODE which can be used is from 0x20 to 0x7F : the alphabet and the number of 0-9 , and space (0x20) , Some signs ,
Command structure
: COMMAND + PARAMETER + CR(0x0D)
COMMAND : ASCII CODE of 2 characters
ex.
PARAMETER : ASCII CODE ( up to 25 characters)
ex.
*Special Parameter--- ? : for request command
SI : Select Input source
MS : surround Mode Setting
MV : Master Volume setting
PW : system PoWer setting
DVD : function name
CDR/TAPE : function name
THX SURROUND EX : surround mode name
SUPER STADIUM : surround mode name
AND carriage return(0x0D)--- It is used only as a pause sign.
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29.Mar.06